World: r4wp

Yes, that's what I've inputted (though, I missed the "restricted" 
part).

restricted is not strictly necessary.

Different package sections; for all of them it'd be "main restricted 
universe multiverse".

I'll check the sources.list file in 11.04 once I finish installing 
12.04.

I can't even find a way to open a terminal in 12.04...why do they 
need to mess up things like that on new versions...

Because they decided to switch to "Unity" ...

(Which isn't unequivocally liked or well-received ...)

Synaptic wasn't updating the sources.list file correctly, changing 
it manually seems to have fix it. At least, I can now install a JDK 
package.

It's funny that they consider opening a terminal, a 2nd class feature 
while LibreOffice comes preinstalled (thanks for the bloat) and many 
icons shortcut are present right on the desktop...I can understand 
now why old linux users got pissed off...

Bo, after sleep, here's one last optimisation for you grayscale comparison 
loop:

img1: img1 + 1
...
im1: (as-integer img1/1) + img1/2 + img1/3 / 3
img1: img1 + 4

Thanks!

APK build script now works on Linux!

Very cool

I am facing this terrible message again and again.
*** Error: word has no value!
I want to know the name of the troublemaker!!

That would be the word you're trying to access before it's defined

It would indeed help if its name were printed

Yes and it is before any print I built in and I am sure there are 
prints before it comes there....

redefining sure.. :)

messed up something completely different along the way. But indeed 
naming the evildoer would have saved a lot of energy.

Is there a difference calling function from Red in included reds 
script vs calling it from a fellow reds script?

Does the #system-global [#include %random-taocp.reds] change 
random-seed: function [seed [integer!]][
    random-taocp/ran_start seed
]
to not longer working?

Sorry.  I don't know anything about that.

Could it have to do with the context random-taocp ?

Have put some files in the folder Red/random compiled randomtest1.reds 
just yet and it still works. But the red script rndtst003.red compiles 
to give an error and not even print the line that was printed in 
ran_start function
ran_start in random-taocp.reds value seed: 310952
Add this to the issue list?

A Red program is very different, because it includes the entire Red 
environment and runtime, which is much larger than the Red/System 
environment

How are you calling your Red/System function from Red?

exactly like I do as I would from the reds counterpart.

That can't work. You can't call Red/System functions in Red

??????

Are you making calls from Red to Red/System, or are you only including 
a #system-global []?

I shared all relevant files. In my view I include using the #system-global 
in randomf.red and I make the calls also via this intermediate red 
script calling random-taocp/ran_start from the random-taocp context 
in the %random-taocp.reds script

Where are the latest ones?

For convenience I kept all scripts in one folder, and rightly so, 
it is hard enough already.

Eh latest ones? in the Red/random (I deleted the randompublic folder 
because it was old and had old files in it anyway)

Well, there you have it. In randomf.red you're using Red/System functions 
and contexts as if they're Red code. They're simply not defined in 
Red

To call Red/System code from Red, you have to write a ROUTINE to 
wrap the differences and marshall the arguments:

https://github.com/dockimbel/Red/commit/1426d1e70d4eaac19444d120f3bbdaa2fa2e438a

I'm getting this when running build.r on Linux Mint (based on Ubuntu):

Generating apk...
/bin/bash: builds/tools/aapt: Bestand of map bestaat niet
Signing apk...
jarsigner: unable to open jar file: builds/eval-unsigned.apk
Aligning apk...
/bin/bash: builds/tools/zipalign: Bestand of map bestaat niet
...all done!

Bestand of map bestaat niet
 means the file doesn't exist

life w be so muchh easier ;-)

It looks for aapt and zipalign in the wrong place, but they're not 
available, anyway

I'm diving into my first attempt at recursion in Red/System.

Thanks Doc, that did it.

Kaj: it worked fine on my Ubuntu system. Did the script download 
the binaries in builds/tools/ ? If not, can you please trace the 
reason why it didn't?

I didn't see any download activity

Try to delete the whole builds/ folder and try again.

It worked now

I ran the script with R3 first, and it bombed out just before the 
downloading. It does very little error checking, so the folder structure 
was already created, and afterwards it skips the download completely

Yes, you're supposed to use R2 for Red. ;-) The download is done 
once only, so it doesn't need extensive error checking, if something 
goes wrong, just delete the builds/ folder and run it again.